Question 1080474
Suppose Mark has forgotten the password to his on-line account that contains six letters or numbers, and they don't repeat. If he types in a different arrangement every 10 seconds, how long will it take him to try all the possible arrangements?
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If it's not case sensitive, ie, if A = a, there are 36 characters.
--> 36*35*34*33*32*31 = 1402410240 possibles.
/6 = 233735040 minutes